Turbulent Energy Conversion Associated With Kinetic Microinstabilities in Earth's Magnetosheath

IF 4.6 1区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY Geophysical Research Letters Pub Date : 2024-12-16 DOI:10.1029/2024gl112038
Harry C. Lewis, Julia E. Stawarz, Lorenzo Matteini, Luca Franci, Kristopher G. Klein, Robert T. Wicks, Chadi S. Salem, Timothy S. Horbury, Joseph H. Wang
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Abstract

Plasma in Earth's magnetosheath rarely experiences interparticle collisions, so kinetic microinstabilities are thought to contribute to regulating the plasma thermodynamics. Instabilities excite waves and redistribute free energy in velocity space, reducing free energy in the velocity distribution function (VDF). Using 24 hr of data spread over 163 intervals of in situ magnetosheath observations by Magnetospheric Multiscale (MMS), we investigate signatures of energy conversion where the turbulent dynamics have locally distorted the VDFs into non-Maxwellian shapes, in the context of electron and ion temperature anisotropy driven instabilities. We find enhanced average energy conversion into the particles along instability boundaries, suggesting turbulence plays a role in redistributing free energy. In so doing, we quantify the energetics associated with unstable conditions for both species. This work provides insight into the open question of how specific plasma processes couple into the turbulent dynamics, ultimately leading to energy dissipation and particle energization in collisionless plasmas.
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地球磁鞘中的等离子体很少发生粒子间碰撞,因此人们认为动能微不稳定性有助于调节等离子体的热力学。不稳定性会激发波并重新分配速度空间中的自由能,从而降低速度分布函数(VDF)中的自由能。利用磁层多尺度(MMS)原位磁鞘观测的163个时间间隔的24小时数据,我们研究了在电子和离子温度各向异性驱动的不稳定性背景下,湍流动力学将速度分布函数局部扭曲成非麦克斯韦形状的能量转换特征。我们发现不稳定边界沿线粒子的平均能量转换增强,这表明湍流在重新分配自由能方面发挥了作用。在此过程中,我们量化了这两种物质与不稳定条件相关的能量学。这项研究深入探讨了特定等离子体过程如何与湍流动力学耦合,最终导致无碰撞等离子体中的能量耗散和粒子能量化这一未决问题。
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来源期刊
Geophysical Research Letters
Geophysical Research Letters 地学-地球科学综合
CiteScore
9.00
自引率
9.60%
发文量
1588
审稿时长
2.2 months
期刊介绍: Geophysical Research Letters (GRL) publishes high-impact, innovative, and timely research on major scientific advances in all the major geoscience disciplines. Papers are communications-length articles and should have broad and immediate implications in their discipline or across the geosciences. GRLmaintains the fastest turn-around of all high-impact publications in the geosciences and works closely with authors to ensure broad visibility of top papers.
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